1. Department of Emergency Medicine (M.R.S., C.R.C., M.S.E.), University of Washington, Seattle.
2. Seattle Fire Department, WA (M.R.S., C.R.C.).
3. King County Emergency Medical Services, Seattle, WA (L.M.B., C.J.D., P.J.K., T.D.R., M.S.E.).
4. Division of Cardiology (P.J.K.), University of Washington, Seattle.
5. Department of Medicine (T.D.R.), University of Washington, Seattle.